Datasheet > AAT2842_07

AAT2842_07

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
22页	621K
描述
High-Current Charge Pump with S2Cwire⑩ Control and Dual LDO for Backlight and Flash

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AAT2842_07 数据手册

AAT2842

High-Current Charge Pump with S Cwire™

Control and Dual LDO for Backlight and Flash

™

ChargePump

General Description

Features

The AAT2842 is a highly integrated charge pump

with dual linear regulators optimized for systems

operating with lithium-ion/polymer batteries. The

charge pump provides power for both white LED

backlight/keypad and flash. Up to four backlight

LEDs can be driven at up to 30mA each and key-

pad LEDs can be driven using lower currents set by

•

V_INRange: 2.7V to 5.5V

Tri-Mode Charge Pump:

— Drives up to Four Backlight/Keypad and

Four Flash LEDs

— Separate S Cwire Control for

Backlight/Keypad and Flash Currents

— Backlight/Keypad and Flash Current Set

by Separate External Resistors

— Flash Timer Set with External Capacitor

— Up to 2MHz Switching Frequency

Two Linear Regulators:

the S Cwire interface. In addition, up to four flash

LEDs can be driven with up to 600mA total. Two

separate S Cwire™ (Simple Serial Control™) serial

digital interfaces are used to enable, disable, and

set the current to one of 16 levels for both backlight

and flash LEDs. Backlight/keypad and flash current

settings are also controlled through external resis-

tors for increased versatility with reduced accuracy

and matching. Backlight/keypad current matching

is 1% for uniform display brightness, and flash cur-

rent matching is 4% for uniform power dissipation.

An internal flash timer set by an external capacitor

protects the flash LED should a fault occur.

•

— 200mA Output Current

— 200mV Dropout

— Output Voltage Adjustable from 1.2V to

V_BATTERY

— Output Auto-Discharge for Fast Shutdown

— 85µA Quiescent Current

Built-In Thermal Protection

Automatic Soft Start

-40°C to +85°C Temperature Range

Available in 4x4mm TQFN44-28 Package

•

The AAT2842 offers two high-performance

MicroPower™ low dropout (LDO) linear regulators.

A single enable input controls both regulators and

each supplies up to 200mA to the load. Both LDOs

consume only 85µA quiescent current, making

them ideal for battery-operated applications.

Applications

•

Camera-Enabled Mobile Devices

Digital Still Cameras

Multimedia Mobile Phones

The AAT2842 is equipped with built-in short-circuit

and over-temperature protection. The charge pump

soft-start circuitry prevents excessive inrush current

at start-up. The product is available in a Pb-free,

space-saving TQFN44-28 package and operates

over the -40°C to +85°C ambient temperature range.

Typical Application

1μF

C1+

C1- C2+

C2-

OUT

C_OUT

2.2μF

AAT2842

C_IN

4.7μF

V_BAT

BL1

BL2

BL3

BL4

FL1

EN_BACKLIGHT

EN_FLASH

BENS

FENS

FL2

FL3

FL4

BSET

FSET

REF

V_OUTLDOA

C_OUTA

OUTA

R_SET

R_2A

R_1A

C_T

R_SET2

FBA

C_REF

V_OUTLDOB

C_OUTB

OUTB

R_2B

R_1B

ENL

EN_LDO

FBB

AGND PGND

2842.2007.09.1.2

12 3 4 5 6 7...22

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与AAT2842_07相关器件

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AAT2842IBJ-EE-T1	ANALOGICTECH	High-Current Charge Pump with S2Cwire⑩ Contro	获取价格
AAT2842INJ-EE-T1	ANALOGICTECH	High-Current Charge Pump with S2Cwire⑩ Contro	获取价格
AAT2845	ANALOGICTECH	Four-Channel Backlight Driver with Dual LDOs	获取价格
AAT2845_08	ANALOGICTECH	Four-Channel Backlight Driver with Dual LDOs	获取价格
AAT2845A	ANALOGICTECH	Four-Channel Backlight Driver with Dual LDOs	获取价格
AAT2845AIML-EE-T1	ANALOGICTECH	Four-Channel Backlight Driver with Dual LDOs	获取价格

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